N-hydroxymethyl acrylamide polymer brush and its application in catalyzing coupling reaction

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Chemistry

Background:

• Surface modification is crucial for developing advanced materials with tailored properties.
• Grafting polymers onto surfaces offers a versatile approach to impart new functionalities.
• Atom Transfer Radical Polymerization (ATRP) is a powerful technique for controlled polymer synthesis.

Purpose of the Study:

• To synthesize poly(N-hydroxymethyl acrylamide) brushes on silicon, glass, and quartz surfaces.
• To functionalize these polymer brushes with cyclopalladated arylimine for catalytic applications.
• To evaluate the catalytic performance and stability of the functionalized brushes in Suzuki cross-coupling reactions.

Main Methods:

• Surface-initiated atom transfer radical polymerization (SI-ATRP) using methyl alcohol/water mixtures and CuCl/2,2-dipyridyl catalyst.
• Surface characterization using water contact angle, AFM, fluorescence spectrophotometry, LAXRD, and XPS.
• Functionalization of polymer brushes with cyclopalladated arylimine via CDI activation.
• Assessment of catalytic activity and recyclability in Suzuki cross-coupling reactions.

Main Results:

• Successful preparation of homogeneous and highly hydrophilic N-hydroxymethyl acrylamide polymer brushes (NHAM-brushes).
• Demonstrated 3-D coating structure of NHAM-brushes, leading to higher binding capacities.
• Obtained cyclopalladated arylimine functionalized polymer brushes with good catalytic activity.
• Showcased improved stability and recyclability of the functionalized brushes in heterogeneous Suzuki cross-coupling compared to homogeneous catalysts.

Conclusions:

• SI-ATRP is an effective method for creating hydrophilic polymer brushes with enhanced properties.
• The functionalized polymer brushes exhibit promising catalytic performance and stability for cross-coupling reactions.
• This approach offers a pathway for developing reusable heterogeneous catalysts for organic synthesis.